No Musks's peace plan was basically "peace"
Nothing else mentioned.
At the moment Russia has given absolutely no indication of wanting peace or being honest about even having a discussion, which means the only way for there to be peace is for Ukraine to give up as Russia is the one that holds the keys to starting any negotiation for an actual peace, as the only two options Ukraine has until Russia shows some honest willingness to discuss things is to either keep fighting for survival (literal given that Russia seems to be willing to actively target civilians), or to give up.
Musk didn't mention any concessions that might be possible, he just said "peace" as if that was all it took.